Only 100 miles from Istanbul, the ancient city of Nicaea, on the shores of Turkey’s Lake Iznik, is not remote or unknown. So archaeologist Mustafa Sahin was in for a shock when a routine aerial survey of the lake revealed traces of a fifth-century basilica. “I did not believe my eyes when I saw it under the helicopter,” says Sahin. “I thought to myself, ‘How did nobody notice these ruins before?’” The site is now slated to become an underwater archaeological museum.